Each haploid bacterium typically has a single chromosome, so this type of replication control is called single copy.

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#Id: 534

#Unit 2. Cellular Organization

An actual overlapping gene occurs when the same sequence of DNA encodes two nonhomologous proteins because it uses more than one reading frame.

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#Id: 4476

#Unit 13. Methods in Biology

Differential-interference-contrast (DIC) microscopy based on splitting of light into two and then recombining them to observe their interference pattern.

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#Id: 4653

#Unit 13. Methods in Biology

Propidium iodide-labeled cells can be identify cells within the populations are at each stage of the cell cycle.

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#Id: 7422

#Unit 5. Developmental Biology

In the recessive mutant of Antennapedia, the gene fails to be expressed in the second thoracic segment, and antennae sprout in the leg positions

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#Id: 492

#Unit 2. Cellular Organization

The metaphase scaffold consists of a dense network of fibers. Threads of DNA emanate from the scaffold, apparently as loops of average length 30 to 90 kb.